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Note 6 - Indebtedness (Details Textual)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended 10 Months Ended
Oct. 18, 2021
USD ($)
Mar. 05, 2021
USD ($)
Aug. 12, 2019
USD ($)
$ / shares
Jan. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2021
USD ($)
Apr. 30, 2021
Mar. 31, 2021
USD ($)
Dec. 31, 2020
Senior Secured Credit Agreement [Member]                    
Debt Instrument, Term (Year)   4 years                
Long-term Debt, Weighted Average Interest Rate, over Time         1.50%          
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage             0.15%      
Line of Credit Facility, Commitment Fee Amount         $ 13 $ 70        
Debt Instrument, Covenant, Maximum Total Leverage Ratio for the First Four Testing Dates   5.50                
Debt Instrument, Covenant, Maximum Total Leverage Ratio for the Sixth, Seventh, and Eighth Testing Dates   5.0                
Debt Instrument, Covenant, Maximum Total Leverage Ratio Following the Eighth Testing date   4.5                
Debt Instrument, Covenant, Maximum Conditional Total Leverage Ratio Following an Acquisition   5.75                
Proceeds from Lines of Credit, Total $ 70,000                  
Repayments of Lines of Credit         10,000          
Long-term Line of Credit, Total         60,000 60,000 $ 60,000      
Senior Secured Credit Agreement [Member] | Subsequent Event [Member]                    
Repayments of Lines of Credit       $ 4,000            
Senior Secured Credit Agreement [Member] | Prepaid Expenses, Other and Other Assets [Member]                    
Debt Issuance Costs, Net, Total         $ 526 $ 526 $ 526   $ 650  
Senior Secured Credit Agreement [Member] | Maximum [Member]                    
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage   0.35%                
Senior Secured Credit Agreement [Member] | Maximum [Member] | The Credit Facility Term Loan [Member]                    
Line of Credit Facility, Maximum Borrowing Capacity   $ 75,000                
Senior Secured Credit Agreement [Member] | Minimum [Member]                    
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage   0.15%                
Fixed Charge Coverage Ratio   1.25                
Senior Secured Credit Agreement [Member] | Minimum [Member] | The Credit Facility Term Loan [Member]                    
Line of Credit Facility, Maximum Borrowing Capacity   $ 25,000                
Senior Secured Credit Agreement [Member] | Swingline Loan [Member] | Maximum [Member]                    
Line of Credit Facility, Maximum Borrowing Capacity   5,000                
Senior Secured Credit Agreement [Member] | Revolving Credit Facility [Member]                    
Line of Credit Facility, Maximum Borrowing Capacity   75,000                
Senior Secured Credit Agreement [Member] | Letter of Credit [Member] | Maximum [Member]                    
Line of Credit Facility, Maximum Borrowing Capacity   $ 2,500                
The Notes [Member]                    
Debt Instrument, Interest Rate, Stated Percentage         1.375% 1.375% 1.375%     1.375%
The Notes [Member] | Senior Notes [Member]                    
Debt Instrument, Term (Year)     6 years              
Debt Issuance Costs, Net, Total         $ 3,360 $ 3,360 $ 3,360   $ 3,328  
Debt Instrument, Face Amount     $ 172,500              
Debt Instrument, Interest Rate, Stated Percentage     1.375%           1.375%  
Debt Instrument, Convertible, Conversion Ratio Per 1,000 Principal     3.5273              
Debt Instrument, Convertible, Conversion Price (in dollars per share) | $ / shares     $ 283.50              
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger     130.00%              
Debt Instrument, Convertible, Threshold Trading Days     20              
Debt Instrument, Convertible, Threshold Consecutive Trading Days     30              
Debt Instrument, Convertible, Consecutive Trading Days, Trading Price Per 1,000 Principal of Notes Less Than 98% of the Product     10              
Debt Instrument, Unamortized Discount and Commissions Including Equity Component     $ 5,175              
Third Party Offering Costs     $ 255              
Debt Instrument, Interest Rate, Effective Percentage         1.90% 1.90% 1.90% 5.50%